#!/bin/bash

die () {
	echo "error: $@" >&2
	exit 128
}

pattern='^[0-9a-zA-Z]{11}$'

if [ "$1" == "-h" -o "$1" == "--help" ]; then
	echo "so-fetch - fetch code from so-db repository"
	echo
	echo "Usage:"
	echo "  so-fetch"
	exit 0
fi

ssh_opts=
for i in ~/.ssh/so-db.key ~/so-db.key ~/linux/so-db.key /usr/local/etc/so-db.key; do
	if [ -r "$i" ]; then
		ssh_opts="$ssh_opts -i $i"
	fi
done

if [ -z "$ssh_opts" ]; then
	echo "so-db.key SSH private key is missing." >&2
	echo "Download the so-db.key from PZE and place in linux directory" >&2
	exit 128
fi

id=$(git config so.id)
if [[ "$id" =~ $pattern ]]; then
	:
else
	read -p "Password: " id
	if ! [[ "$id" =~ $pattern ]]; then
		die "invalid password"
	fi
	git config so.id "$id"
fi

echo "FETCH $id" | ssh -o BatchMode=yes -T \
	$ssh_opts \
	so-db@so.podlesie.net \
| (
	read HEAD
	git unpack-objects
	git reset --hard "$HEAD"
)